Ships and marine technology -- Check valves for use in low temperature applications -- Design and testing requirements

This document specifies requirements of design, manufacture, and test methods for cryogenic check valves to have excellent quality of leakage stability in very low temperature environments (−50 °C to −196 °C).

Navires et technologie maritime -- Clapets de retenue destinés aux applications à basse température -- Exigences de conception et d'essai

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Status
Published
Publication Date
06-May-2019
Current Stage
6060 - International Standard published
Start Date
10-Apr-2019
Completion Date
07-May-2019
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ISO 20602:2019 - Ships and marine technology -- Check valves for use in low temperature applications -- Design and testing requirements
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INTERNATIONAL ISO
STANDARD 20602
First edition
2019-05
Ships and marine technology — Check
valves for use in low temperature
applications — Design and testing
requirements
Navires et technologie maritime — Clapets de retenue destinés aux
applications à basse température — Exigences de conception et d'essai
Reference number
ISO 20602:2019(E)
ISO 2019
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ISO 20602:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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Published in Switzerland
ii © ISO 2019 – All rights reserved
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ISO 20602:2019(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Pressure temperature rating ................................................................................................................................................................... 3

4.1 Types of fluids .......................................................................................................................................................................................... 3

4.2 Working pressure and designed temperature ............................................................................................................. 3

5 Design .............................................................................................................................................................................................................................. 3

5.1 General structure of a check valve ......................................................................................................................................... 3

5.2 Materials — General ........................................................................................................................................................................... 3

5.3 Body .................................................................................................................................................................................................................. 4

5.3.1 Materials ................................................................................................................................................................................. 4

5.3.2 Manufacturing .................................................................................................................................................................... 4

5.4 Cover (bonnet) ........................................................................................................................................................................................ 5

5.4.1 Types .......................................................................................................................................................................................... 5

5.4.2 Materials ................................................................................................................................................................................. 5

5.5 Disc .................................................................................................................................................................................................................... 5

5.5.1 Types .......................................................................................................................................................................................... 5

5.5.2 Materials ................................................................................................................................................................................. 5

5.6 Gasket .............................................................................................................................................................................................................. 5

5.7 Valve Seat ..................................................................................................................................................................................................... 5

5.7.1 Types .......................................................................................................................................................................................... 5

5.7.2 Materials ................................................................................................................................................................................. 6

5.8 Hinges and hinge pin (as applicable)................................................................................................................................... 6

5.8.1 Types .......................................................................................................................................................................................... 6

5.8.2 Materials ................................................................................................................................................................................. 6

5.9 Bolts and nuts .......................................................................................................................................................................................... 6

5.9.1 Types .......................................................................................................................................................................................... 6

5.9.2 Materials ................................................................................................................................................................................. 6

6 Surface treatment ................................................................................................................................................................................................ 6

7 Welding and heat treatment ..................................................................................................................................................................... 6

7.1 Welding .......................................................................................................................................................................................................... 6

7.2 Heat treatment ........................................................................................................................................................................................ 6

8 Test and inspection ............................................................................................................................................................................................ 6

8.1 Material test ............................................................................................................................................................................................... 7

8.2 Non-destructive inspection .......................................................................................................................................................... 7

8.2.1 Radiographic testing (RT) ........................................................................................................................................ 7

8.2.2 Penetrant testing (PT) ................................................................................................................................................. 7

8.2.3 Ultrasonic testing (UT) ............................................................................................................................................... 8

8.2.4 Retest ......................................................................................................................................................................................... 8

8.2.5 Reporting test result ..................................................................................................................................................... 8

8.3 Dimension check ................................................................................................................................................................................... 8

8.4 Visual inspection ................................................................................................................................................................................... 8

8.5 Heat treatment inspection ............................................................................................................................................................ 8

8.6 Pressure tests ........................................................................................................................................................................................... 8

8.7 Fire safety test ......................................................................................................................................................................................... 9

8.8 Cryogenic tests ........................................................................................................................................................................................ 9

8.8.1 Test scope ............................................................................................................................................................................... 9

8.8.2 Test procedure ................................................................................................................................................................... 9

8.8.3 Submission of test result ........................................................................................................................................10

9 Marking .......................................................................................................................................................................................................................11

© ISO 2019 – All rights reserved iii
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ISO 20602:2019(E)

Annex A (informative) Cryogenic check valves — Examples ....................................................................................................12

iv © ISO 2019 – All rights reserved
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ISO 20602:2019(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www .iso .org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,

Subcommittee SC 3, Piping and machinery.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
© ISO 2019 – All rights reserved v
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INTERNATIONAL STANDARD ISO 20602:2019(E)
Ships and marine technology — Check valves for use
in low temperature applications — Design and testing
requirements
1 Scope

This document specifies requirements of design, manufacture, and test methods for cryogenic check

valves to have excellent quality of leakage stability in very low temperature environments (−50 °C to

−196 °C).
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 5209, General purpose industrial valves — Marking

ISO 28921-1, Industrial valves — Isolating valves for low-temperature applications — Part 1: Design,

manufacturing and production testing
API 594, Check Valves: Flanged, Lug, Wafer, and Butt-welding
API 598:2016, Valve Inspection and Testing
API 6FA, Specification for Fire Test for Valves
ASME B16.5, Pipe Flanges and Flanged Fittings
ASME B16.10, Face-to-Face and End-to-End Dimensions of Valves
ASME B16.25, Buttwelding Ends
ASME B16.34:2017, Valves-Flanged, Threaded, and Welding End
ASME BPVC Sec. V, Nondestructive Examination
ASME BPVC Sec. VIII, Div.1:2018,Pressure Vessels

ASTM A182, Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged

Fittings, and Valves and Parts for High-Temperature Service

ASTM A194, Standard Specification for Carbon Steel, Alloy Steel, and Stainless Steel Nuts for Bolts for High

Pressure or High Temperature Service, or Both

ASTM A320, Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service

ASTM A351/A351M, Standard Specification for Castings, Austenitic, for Pressure-Containing Parts

ASTM E186/280/446, Standard Reference Radiographs for Heavy-Walled Steel Castings

BS 1868, Specification for steel check valves (flanged and butt-welding ends) for the petroleum,

petrochemical and allied industries
BS 6364, Specification for valves for cryogenic service
© ISO 2019 – All rights reserved 1
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ISO 20602:2019(E)

MSS SP-55, Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping Components

- Visual Method for Evaluation of Surface Irregularities
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http: //www .electropedia .org/
— ISO Online browsing platform: available at http: //www .iso .org/obp
3.1
nominal diameter

alphanumeric designation of size for components of a pipework system, used for reference purposes

which comprises the letters DN followed by a dimensionless whole number that is related to the physical

size, in millimetres, of the bore or outside diameter of the end connections

Note 1 to entry: The number following the letters DN does not represent a measured value and shall not be used

for calculation purposes except where specified in the relevant standard.

Note 2 to entry: In those standards that use the DN designation system, any relationship between DN and

component dimensions shall be given, e.g. DN/OD or DN/ID.
[SOURCE: ISO 18139:2017, 3.1]
3.2
nominal pressure

numerical designation relating to pressure that is a convenient round number for reference purposes

Note 1 to entry: It is intended that all equipment of the same nominal size (DN) designated by the same PN

number shall have the same mating dimensions appropriate to the type of end connections.

Note 2 to entry: The permissible working pressure depends upon materials, design and working temperature

and has to be selected from the pressure/temperature rating tables in corresponding standards.

[SOURCE: ISO 18139:2017, 3.2]
3.3
nominal pipe size
NPS

dimensionless number for the purpose of pipe, flange, or flanged fitting end connection size

identification

Note 1 to entry: The number is not necessarily the same as the flange or flanged fitting inside diameter.

[SOURCE: ISO 18139:2017, 3.3]
3.4
class

alphanumeric designation used for reference purposes related to a combination of mechanical and

dimensional characteristics of a component of a pipework system, which comprises the word “class”

followed by a dimensionless whole number
[SOURCE: ISO 18139:2017, 3.4]
2 © ISO 2019 – All rights reserved
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ISO 20602:2019(E)
4 Pressure temperature rating
4.1 Types of fluids
The types of fluids are shown in Table 1.
Table 1 — Types of fluids
Temperature
Type Liquid density (density)
(in atmospheric pressure)
LNG
−163 °C to −88 °C (434 kg to 478 kg/m )
(Liquefied natural gas)
−160 °C to −65 °C (0,7 kg to 0,89 kg/ m )
(Natural gas)
LN2
−196 °C (804 kg/m )
(Liquefied
...

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